Improvement in locomotive-boilers



UNITED STATES PATENT OEmcE.

SAMUEL GRAW' F ORD, OF NEW YORK, N. Y.

IMPROVEMENT IN LOCOMOTlVE-BOILERS.

Specification forming part of Letters Patent No'. 49,236, dated August 8, 1865.

To all whom it may concern:

Be it known that I, SAMUEL CRAWFORD, of the city and State of New York, have invented certain new and useful improvementsin the construction of the bottoms of the water-legs surrounding the hre-boxes of locomotives or other boilers of similar construction in this respect, of which the following is a specification.

The bottoms of the water-legs as now constructed are hermetically or fxedly closed. It is Well known that the unavoidable (in most cases) deposit or scaling that takes place in these parts, owing to the limited circulation,

.&c., causes a deterioration of strength by corrosion or burning, or both, and the removal through the small apertures that can be provided of scale and deposit is always difficult and but partial. The same observation applies to repairing or patching such a boiler atthese parts.

The main featureof my device is to close the space at the bottom, between the sheets composing the water-leg or hollow wall of the furnace, by a continuous frame thatwill be water and steam tight to all practical purposes at its As will be understood by inspection of the.

drawings, the lower edges of the walls,asAA, of the furnace are received and confined each in a corresponding channel or groove, as A A', Fig. I. This frame has also a series of projections,as B B, Fi gs.I, II,which are bored through transversely to the body of the frame, Fig. I, to receive removable stay-bolts, as C, Fig. II,

which, passing through the sheetsA A and the frame, connect the latter with the boiler in a proper manner, these stay-bolts having a countersunk head at the inner side of' the re-box and a screw-nut at the outside.

To facilitate the drawing up ofthe frame to its place and the insertion of the stay-bolts, I have, at certain intervals, what I call drawin gbolts, one of which is represented in section D, Fig. III. They are bolts that project vertically down through the frame, while the head of each is formed like one of the projections B B, and receives a corresponding staybolt, and the lower end having a screw-nut, the manner of tightening up the frame to its place will be understood. The best places for putting the holes through the frame for receiving these bolts are indicated by e e, Fig. I.

It will be readily understood that different kinds ofpacking maybe inserted atthe bottom of the groovesA A', Fig. I,in the frame, which receive the edges of A A,Fig. II; or,in other words, the edges of the sheets constituting theiinner and outer walls of the fire-box packing y may also be inserted under the' heads cf the drawing-bolts. At itsjunction with the seams of the boiler the groove in the frame will have to be chipped out to fit,and thelower edges of A A should be properly dressed 0E, as will be understood.

Having new described my invention, what I cla-im, and desire to secure by Letters Patent, is-

The plan of making the bottoms ofthe waterlegs or hollow walls ofthe furnaces of steamboilers of the character described-a removable butsteamtightframeby the employment of the devices substantially such as described, and for the. reasons and purposes explained.

SAMUEL CRAWFORD.

Witnesses:

J osEPH E. COFFEE, Jr., WM. MONT SToRM. 

